api-security

api-security is a skill for Claude Code, Codex from jim60105/copilot-prompt. It costs 198 tokens per session (1,963 once invoked), scanned A, original, GFDL-1.3.

A set of guidelines for building and checking secure REST, GraphQL, or gRPC APIs using the OWASP API Security Top 10, a widely used list of API risks.

In plain words
What is it for?
Use it to review API code or designs, plan a secure API architecture, or implement API authentication and related protections.
Why use it?
It helps find and prevent common problems involving authentication, access control, and other API security areas.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/jim60105/copilot-prompt/api-security
Any agent
npx skills add jim60105/copilot-prompt --skill api-security
Clone the repo
git clone --depth 1 https://github.com/jim60105/copilot-prompt

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for api-security

README.md
[![agentmods](https://agentmods.dev/badge/skills/jim60105/copilot-prompt/api-security.svg)](https://agentmods.dev/skills/jim60105/copilot-prompt/api-security)
Your own site
<a href="https://agentmods.dev/skills/jim60105/copilot-prompt/api-security"><img src="https://agentmods.dev/badge/skills/jim60105/copilot-prompt/api-security.svg" alt="Measured on agentmods" height="20"></a>
Per session 198 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,963 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00198 $0.01963
Opus 5 $0.00099 $0.00981
Sonnet 5 $0.00040 $0.00393
Haiku 4.5 $0.00020 $0.00196

Measured 4d ago against content hash 9e85840cff02, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

api-security scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/api-security/SKILL.md · 142 lines

The source is not reproduced here

Licensed GFDL-1.3

The repository is licensed GFDL-1.3, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

Files

What ships with it

3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 4d ago First seen · 142 lines · 198 tokens per session scan A 9e85840cff02

Subscribe to this mod's changes

api-security is a skill published in the GitHub repository jim60105/copilot-prompt (21 stars, last pushed today), licensed GFDL-1.3. It adds 198 tokens to every session and 1,963 once invoked, about $0.0010 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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